docs(ble/bluedroid): Optimize BLE example documentation

examples/bluetooth/bluedroid/ble/gatt_security_client/main/example_ble_sec_gattc_demo.c

@@ -458,6 +458,8 @@ static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *par
             ESP_LOG_BUFFER_CHAR(GATTC_TAG, adv_name, adv_name_len);
             if (adv_name != NULL) {
                 if (strlen(remote_device_name) == adv_name_len && strncmp((char *)adv_name, remote_device_name, adv_name_len) == 0) {
+                    // Note: If there are multiple devices with the same device name, the device may connect to an unintended one.
+                    // It is recommended to change the default device name to ensure it is unique.
                     ESP_LOGI(GATTC_TAG, "Device found %s", remote_device_name);
                     if (connect == false) {
                         connect = true;